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          节流、防抖函数
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        <p>节流和防抖函数是开发中常用到的两个工具类型的函数，因此要求能够手写这两个函数加深理解</p>
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<h2 id="防抖函数"><a href="#防抖函数" class="headerlink" title="防抖函数"></a>防抖函数</h2><p> 停止触发事件后，经过规定的延时再执行处理函数，如果在延时的时候又触发了事件，计数器重新倒计时</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">function</span> <span class="title function_">debounce</span>(<span class="params">fn, wait</span>) &#123;</span><br><span class="line">  <span class="keyword">let</span> timeout = <span class="literal">null</span>;</span><br><span class="line">  <span class="keyword">return</span> <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="keyword">if</span> (timeout !== <span class="literal">null</span>)</span><br><span class="line">      <span class="built_in">clearTimeout</span>(timeout);</span><br><span class="line">    timeout = <span class="built_in">setTimeout</span>(fn, wait);</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h2 id="节流函数"><a href="#节流函数" class="headerlink" title="节流函数"></a>节流函数</h2><p>频繁触发事件的时候，每隔一定延时处理事件</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//时间戳实现</span></span><br><span class="line"><span class="keyword">function</span> <span class="title function_">throttle</span>(<span class="params">func, delay</span>) &#123;</span><br><span class="line">  <span class="keyword">var</span> prev = <span class="title class_">Date</span>.<span class="title function_">now</span>();</span><br><span class="line">  <span class="keyword">return</span> <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="keyword">var</span> context = <span class="variable language_">this</span>;</span><br><span class="line">    <span class="keyword">var</span> args = <span class="variable language_">arguments</span>;</span><br><span class="line">    <span class="keyword">var</span> now = <span class="title class_">Date</span>.<span class="title function_">now</span>();</span><br><span class="line">    <span class="keyword">if</span> (now - prev &gt;= delay) &#123;</span><br><span class="line">      func.<span class="title function_">apply</span>(context, args);</span><br><span class="line">      prev = <span class="title class_">Date</span>.<span class="title function_">now</span>();</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//定时器</span></span><br><span class="line"><span class="keyword">function</span> <span class="title function_">throttle</span>(<span class="params">func, delay</span>) &#123;</span><br><span class="line">  <span class="keyword">var</span> timer = <span class="literal">null</span>;</span><br><span class="line">  <span class="keyword">return</span> <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="keyword">var</span> context = <span class="variable language_">this</span>;</span><br><span class="line">    <span class="keyword">var</span> args = <span class="variable language_">arguments</span>;</span><br><span class="line">    <span class="keyword">if</span> (!timer) &#123;</span><br><span class="line">      timer = <span class="built_in">setTimeout</span>(<span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">        func.<span class="title function_">apply</span>(context, args);</span><br><span class="line">        timer = <span class="literal">null</span>;</span><br><span class="line">      &#125;, delay);</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h2 id="节流和防抖的区别和适用场景"><a href="#节流和防抖的区别和适用场景" class="headerlink" title="节流和防抖的区别和适用场景"></a>节流和防抖的区别和适用场景</h2><p>区别：如果时延均为200ms，连续触发一个事件1001ms后停止，那么节流会执行6次执行函数（第一次会立刻执行），而防抖只会在停止事件后200ms触发执行1次<br>防抖适用场景：用户输入表单验证或者是搜索联想<br>节流适用场景：用户向下滚动无限加载（不能像防抖那样用户滚动完了才开始加载）</p>

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